S1 문장의 [______]에 들어갈 단어는?

난이도 고난도 · 힌트를 덜 열수록 높은 점수 (현재 5점)
In making sense of cave art, [______] have turned to surviving hunter gatherer societies that continue to paint inside caves, particularly the San peoples, who live in communities across a wide region of southern Africa.